Overview

overview

10

Static

static

10

Client-built.exe

windows7-x64

10

Client-built.exe

windows10-2004-x64

10

Resubmissions

15-10-2024 18:43

241015-xcv14avdjn 10

15-10-2024 00:19

241015-al9jhstelf 10

15-10-2024 00:16

241015-akkh1atdpd 10

14-10-2024 23:42

241014-3qeh6awdrq 10

14-10-2024 23:27

241014-3fm3jswaqk 10

Analysis

  • max time kernel
    150s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240729-en
  • resource tags

    arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
  • submitted
    15-10-2024 00:19

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    e35d832888fda0fd705386a4b94ecc49

  • SHA1

    86380c3eea496c7947c25c547748cfeed51c4de9

  • SHA256

    aa3170ce6b4bbd9960ac0ccd60f7d0b39cc0d28254bfe73545b540cbd8444b21

  • SHA512

    60d6aec705948474fa007dad26fdba9b92dcb1098aefb4eed2898af7b048729e4a3ee5af7e7b9ca9e555b97b54f6d97007dfc1531d0abb9e5da01b5911c5fd63

  • SSDEEP

    49152:Av4lL26AaNeWgPhlmVqvMQ7XSKNEREuY4oGdPwTHHB72eh2NT:AvQL26AaNeWgPhlmVqkQ7XSKmREuT

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

HomoThugger-36407.portmap.host:36407

Mutex

42d6f4c0-e8fc-473a-b92d-ded3fb29334a

Attributes
  • encryption_key

    3CDA48FEB25557C87485A9F37CDC861398BEA3C7

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar payload 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistenceexecution
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:2296
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:3016

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/2296-0-0x000007FEF5AF3000-0x000007FEF5AF4000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2296-1-0x0000000000F00000-0x0000000001224000-memory.dmp

    Filesize

    3.1MB

    Download

  • memory/2296-2-0x000007FEF5AF0000-0x000007FEF64DC000-memory.dmp

    Filesize

    9.9MB

    Download

  • memory/2296-3-0x000007FEF5AF3000-0x000007FEF5AF4000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2296-4-0x000007FEF5AF0000-0x000007FEF64DC000-memory.dmp

    Filesize

    9.9MB

    Download